Conduit cutting apparatus



March 22', 1932. .1. F. MAKowsKl CONDUIT 'CUTTING APARATus Filed July 16, 1929 2 Sheets-Shee .mwrw

Q n m March 22, 1932'.- J. F. MAKOWSKI 1,850,327

ooNDUT CUTTING APPARATUS Filed July 16, 1929 2 Sheets-Sheet 2 INVENTOR ATTORN EY Patented Mar. 22, 1932 UNITED STATES PATENT FFICE y OHN I'. MAKWSKI, OF OAKLAND, CALEORNIA, ASSIGNOR TO FIREPROOF W'ALL COMPANY, OE RENO, NEVADA, A CORPORATION F NEVADA COND'UIT CUTTING .APPARATUS Application filed July 16, 1929. Serial No. 378,658.

This invention relates to the manufacture j 'of tubular clay. products such as cable conduit,

sewer tile, drain tile, water pipe etc. and particularly to a means for cutting the plastic tubes into sections of predetermined lengths as they emerge from the press 0r forming machine in whichthey are made. y

n tubular roducts of this character, particularly cab e conduit, it is essential that there be no deformation of the cross sectional avoid this deformation and roughness by providing a cutting means disposed inside the conduit and arranged to cut from the bore outwardly; and which as it cuts forms a smooth chamfer about the bore on both sides of and immediately adjacent the line of cut.

A further object is to mount the cutter so that it may be easily withdrawn from a cut section or length of conduit to enable the latter to be withdrawn from association with the cutting apparatus, and another length to be then fed into place to be cut.

A further object of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purpose for which it is designed.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Fig. l is a sectional elevation of my improved cutting apparatus as operating on a length of conduit. i

F ig. 2 vis an enlarged elevation partly in section of the cutting unit detached.

Fig. `3 is an enlarged cross section taken substantially on the line 3 3 of Fig. l..

F ig. fl is a rear end view of the cutting unit showing the position ofthe operating handle when the cutter is in its cutting position.

-Fig. 5 is a cross-section of the apparatus as taken on'the line 5 5 of Fig.y l showing the cutter retracted from its operative position. A.

Fig. 6 is a rear end viewk of the cutter unit showing theL position of the operating handleV when the cutter is retracted or inoperative.

Referring now more particularly to the characters of reference on the drawings, the apparatus comprises a horizontal support l having `a fixedtrough 2 toward one end al-ong which the conduit C as it isformed is fed from the forming machine which is preferably of that character shown in my copending application for patent Serial No.

278,786 filed May 18th, 1928. This trough terminates at a vblock unit 3 fixed on the support l, which unit is orificed concentric with the trough to enable the conduit to pass therethrough. The upper portion 3a of this unit issplit on the horizontal diametral line of the orifice and is removable from the lower portion, being slidably mounted on Vertical pins lprojecting upwardly from the latter. Some distance beyond the block 3 a stop block 5 is fixed on the support l, which block 5 has a central orifice 6 therethrough concentric with that of the block 3 but of insuiiicient size to allow the conduit to pass through the same. Between the yblocks the formed conduit as it advances is supported on a removable cradle 7 which rests on supports 8 disposed adjacent said blocks.

Disposed beyond the block 5 are longitudinally spaced bearings 9 in which a hollow cylindrical bar 10 is both turnable and slidable. This bar has collars ll on both ends limiting the sliding movement of the bar relative to the bearings in both directions.

'Turnable in bearings 12 mounted in the ends of the bar is a shaft 13, offset or eccen- V tric relative to the axis of the bar and projecting beyond the ends of the same. On one end of the shaft outwardly of the bearings 9 a crank handle 14 is fixed, while on the other end of the shaft a relatively kshort crank 15 1C is secured. On the outer end of the crank a disc cutter, 16, is turnably mounted, the diameter of lthis discbeing somewhat smaller than the orifice 6 and of course smallerthanwthebore of the conduit.y .The crank is.pro-

15 portioned so that when it is turned toa cer-l tain position the disc will be concentric with the bar and when turned to rapeint substantially diametrally opposed to such position the outer periphery of the' disc is then in the I 25 plane of the outer periphery of the conduit.

@Opposed'stops'Y- 17 proJectl outwardly', from the collar 11 nearest the handle toengage the:

f-latterfllhese stops are y ositioned y'so that when the-handle is turn'e clockwise lor in a fright-hand direction to engage-one stop the I discfwillbein a cuttingfposition; and'when said handle is turned 'a certaingamountin 'f the oppositeoriin an anti-clockwise direction toei'rgage the other stop -the disc will Vthen 33 lbein a-retracted orfcentr'alized position relative to the bar.

EBevelV Aor sloping faced' discs -181of smaller diameterthan the cutting'- disc-'gare mounted inclose connection therewith -on both sides k223 of the same, being of such size relative to, the

*thickness-fof thefconduit as to cause a bevel or 'chamfer' asl ya't'f1,9-to`--bel depressed in the pbore ofthe fconduit-adjacent and on'I-both Tsidesof, the planefof the cut. n The lengthof 43 E,thebar is such? thatwhen the collar- 11 atthe f Y--outerend 'abuts against the adjacent bearing Qthe cutting disc isposit-ioned substantially midway between '1 the ends ofthe 'block 3.

n 55 ifedi;fromithemachine until itfabutsvagainst "theblock 5 1Whichfofcourse limits its advancmoveme'nt.` {While-theconduit vis being thusadvanc'ed thecutting disc ismovedto its 4centraliZed inoperative position and the bar 4isV retracted sotha-t' thedisc is enclosed by the block 5;"''l'1`he bar is thenadvanced to itsl limit "of vmovement 4inside the conduit and when vfullyiadvanced thekhandle l141 is rotated so as to throw the-disc vinto eccentric relation to the banandl into a cutting position.` VBy the time "tire, circumference.

til dry.

the handle abuts against the corresponding stop 17 the cutter has been pressed through the still soft material of the conduit to the outer periphery of the same anda further bevel discs 18 press thedesired chamfers in plane of cutting being in the block Stile latter prevents thefn'iaterial being forced outwardly The cut having kbeen made the handle 14 is rotated in thenopposite direction to retract the discto its central position, and the, bar is then Withdrawnto its vopposite limit ofmovement. f 'The upperfblock member 3a' is then.

the-conduit as previously explained. The.

At, the same time Vthe'y `Withdrawn which'permitsthe cuttingsection c with its supporting 'cradle T@ to be-remov'ed together-fand stacked in a suitable location un- Another cradle 7 isthen placed in position, the block 3a is replaced and thewconduit; may then; bey further'advanced so as to enable another cutting 'operation tobe "effected. y f l' From the foregoing description it will be readily seenfthat Il have produced such a device/as substantially fulfills theobjects' of the invention as set forth herein. 4 /Vhilethis specification sets -forth in detail the present andl preferred construction of the device,` still in Ypractice ysuch deviationsfrom such detail may be resorted to as do not lform Y a ydeparture fromV the spirit ofV the invention,

.as defined by the appended claims; lHaYing thus described my inventionwvliat I-claim as new and usefulyand, desirel to secure 1.Y A devicefor cutting al tubular member c -into lengths including aA support for; the member, a bar., meansvbeyond said support slidably and" turnably supporting saidfbar in concentric relation lwith i the su pported member, a stop yfor the member between the bai-'and member supportsandthrough which one end v of said bar may project, a cutting disc at said end ofthebar of smaller diameterthan the vbore yof the member,` meanssupporting said "dlscfrom'ithe bar to., enable the dlsc bemg positioning the disc, and means between said Y bar and operating means to enable4 the bar to berotated when the disc is eccentrically positioned. v f

2. A device for cutting a tubular member into lengthsincluding a'turnable bar adapted to be lprojected from itsouter end intofthe member concentric therewith, ashaftturnably mounted in and extending through the bar in eccentric relation to the axis of the bar, a crank on the shaft at the outer end of the bar, a cutting disc mounted on the outer end of the crank, the axis of the disc relative to that of the shaft and bar being such that a turning of the crank to a certain position will place the disc concentric with the bar, and a turning of the crank to another position will move the outer periphery of the disc into the plane of the outer periphery of the member, a handle on the opposite end of the shaft for rotating the same, and stop means between the bar and handle limiting the rotation of the shaft in either direction independently7 of the bar to an arcuate amount corresponding to the arcuate movement of the crank between its two positions.

3. A device for cutting a tubular member into lengths including a turnable bar adapted to be projected from its outer end into the member concentric therewith, a shaft turnably mounted in and extending through the bar in eccentric relation to the axis of the bar, a crank on the shaft at the outer end o f the bar, a cutting disc mounted on the outer end of the crank, the axis of the disc relative to that of the shaft and bar being such that a turning of the crank to a certain position will place the disc concentric with the bar, and a turning of the crank to another position will move the outer periphery of the disc into the plane of the outer periphery of the member, and means operable from the other end of the bar for selectively moving the crank and disc to said position.

4. A device for cutting a tubular member into lengths including a turnable bar adapted to be projected from its outer end into the member concentric therewith, a shaft turnably mounted in and extending through the bar in eccentric relation to the axis of the bar, a crank on the sh aft at the outer end of the bar, a cutting disc mounted on the outer end of the crank, the axis of the disc relative to that of the shaft and bar being such that a turning of the crank to a certain position will place the disc concentric with the bar and a turning of the crank to another position will move the outer periphery of the disc into the plane of the outer periphery of the member, means operable from the other end of the bar for selectively moving the crank and disc to said position, and means between the bar and operating means for enabling the bar and crank to be rotated as a relatively immovable unit when said crank has been moved to place the disc in said eccentric position.

5. A cutter unit comprising a bar, a shaft eccentric to the bar and rotatable therein, a crank on the shaft having the axis of its outer end normally concentric with the bar, a cutting blade on said outer end of the crank,

" and means to limit the independent rotation of said shaft within the bar in either direction.

f 6. Means for cutting a tubular member into ylengths comprising supporting means for a definite length of said member,.a block unit to closely surround said member at one end of the supporting means and including a removable cap portion, and means insertible in and removable from the endL of the member opposite the block for cutting the men'iber through circumferentially and from the insidek out, and means to locate the cutting means when in operation in a. longitudinal plane intermediate the ends of the block unit.

7. Means for cutting a tubular member into lengths comprising supporting means Yfor a definite length of said member, a bar projectable into the supported member from its outer end, a cutter on that end of the bar which is adapted to be thus projected, said cutter being arranged to engage and cut the member through circumferentially from the inside out; bearing means for the bar beyond the member supporting means in which said bar is both turnable and slidable, said bearing means being arranged to maintain the bar axially alined with the member and to permit said bar being completely withdrawn from such member.

8. A cutter for a tubular member comprising a cutting element, a support for the element, means in which said support is mounted adapted to be moved lengthwise into the member from the 'outer end thereof, and means between said support and the first named means for positively moving said element into cutting relationship with the interior periphery of the member and for then rotating the element with the axis of the member as the axis of rotation of the element.

9. A cutter for a tubular member comprising a cutting element, a support for the element, a turnable bar in which said support is mounted adapted to be moved lengthwise into the member from its outer end, and means between the support and bar for first moving the support to a position such that the cutting element engages the member, and for then rotating the bar, in one continuous operation.

l0. A cutting device for a tubular member comprising a support for the member, a bar mounted in connection with the support for turning and longitudinal movement and disposed in axial alinement with a supported member, a shaft eccentrically and turnably mounted in the bar, a crank on the shaft outwardly of the bar having its outer axis normally concentric with the bar, a cutting disc mounted on said axis of lesser diameter than the bore of the member, and means for turning the shaft so that the crank and disc are eccentric to the bar a predetermined extent.

l1. A device as in claim 10, with means between the bar and said shaft turning means V7"ior'fthen enabling the bar andrsh erV rotated as a. unit. v

y12L1Means for cutting a tubularrnember into lengths ,including a support vfor the Jmember, a. turnable bar, meansr supporting rthe bar-axially of the supported member for movement into the member from one end thereof, a-cutting disc at the outer end of the barysaid disc being 'smaller than the diameter-0f the member, means mounted in unitary connection with the bar for supporting said discand means provided and formed-in part Vwith the disc supportingmeans .for placing the disc eccentric with the barand for then -rotatingtheflatten or for placing the disc concentric with the bar selectively.

'11n testimony whereof I alix my signature. J OHN F. MAKOWSKI. 

